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06reverse_stack.cpp

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//reverse recursively

#include<iostream>

#include<stack>

using namespace std;

void push_at_bottom(stack<int>& st,int val){

if(st.size()==0) {

st.push(val);

return;

}

int x = st.top();

st.pop();

push_at_bottom(st,val);

st.push(x);

}

void display(stack<int>& st){

if(st.size()==0) return;

cout<<st.top()<<endl;

int x = st.top();

st.pop();

display(st);

st.push(x);

}

void reverse(stack<int>& st){

if(st.size()==0) return;

int x = st.top();

st.pop();

reverse(st);

push_at_bottom(st,x);

}

int main(){

stack<int> st;

st.push(50);

st.push(40);

st.push(30);

st.push(20);

st.push(10);

display(st);

cout<<endl;

reverse(st);

display(st);

}